Berberis sources -off subject-sorry

I know this is not exaclty a mediterannean plant, but does anyone know
of good US mail order sources of various species/varieties of berberis?

I want to get some dwarf ones (and preferably evergreen/red and very
thorny).  I have a Herronswood catalog, and while he has a nice
selection, he tends to be much more poetic than descriptive in what he
writes about his offerings, so you can't really tell what size most will
eventually become.  (Nice reading, but not very helpful when you want
specifics).  I realy don't know of other US possible mail order
sources.  ANy ideas (Or ideas of oother lists where I might inquire?)
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